My Australian friends just did a walk out/walk in border run to get another visa exempt 30 days at Mae Sai. It took less the 15 minutes and was a pleasant experience. No requirements at all. It was their first land crossing.
TLDR : Answer Summary
The user shares an experience of their Australian friends performing a border run at Mae Sai, where they successfully obtained an additional 30 days of visa exemption with no requirements. The entire process took less than 15 minutes and was described as pleasant, especially since it was their first land crossing.